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Pension and Retirement Plans - Components of net periodic benefit costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ (1,972) | $ (150)
U.K. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (1,794) | (231)
U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (178) | 81
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 254 | 278
Expected return on plan assets | (398) | (289)
Amortization of past service costs | 7 | 7
Amortization of net gain (loss) | 185 | 193
Net periodic benefit cost | 48 | 189
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (1,802) | (229)
Pension | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 243 | 263
Pension | U.K. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 243 | 263
Expected return on plan assets | (398) | (289)
Amortization of past service costs | 7 | 7
Amortization of net gain (loss) | 181 | 190
Net periodic benefit cost | 33 | 171
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (1,794) | (231)
Pension | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Interest cost | 11 | 15
Amortization of net gain (loss) | 4 | 3
Net periodic benefit cost | 15 | 18
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (8) | 2
Post Retirement |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 45 | 38
Interest cost | 42 | 46
Amortization of net gain (loss) | 50 | 24
Net periodic benefit cost | 137 | 108
Increase (decrease) in minimum liability included in other comprehensive income (loss) | (170) | 79
Post Retirement | U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 45 | 38
Interest cost | 42 | 46
Amortization of net gain (loss) | 50 | 24
Net periodic benefit cost | 137 | 108
Increase (decrease) in minimum liability included in other comprehensive income (loss) | $ (170) | $ 79

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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